Spray Foam vs. Fiberglass: Which Insulation is Right for Michigan Homes?
Choosing the Right Insulation for Michigan’s Climate
Insulation plays a critical role in maintaining a comfortable and energy-efficient home, especially in Michigan, where winters are harsh, and summers can be humid. Homeowners often choose between spray foam and fiberglass insulation, each offering distinct advantages depending on factors like budget, home structure, and energy efficiency goals.
This guide breaks down the key differences between these two insulation types, helping Michigan homeowners make informed decisions.
Understanding the Basics of Insulation
How Insulation Works
Insulation slows heat transfer, keeping homes warm in winter and cool in summer. The effectiveness of insulation is measured by R-value—the higher the R-value, the better the material resists heat flow.
Both spray foam and fiberglass have different R-values and installation methods, which impact their overall performance in Michigan’s varied climate conditions.
Common Insulation Challenges in Michigan Homes
Cold Winters: Preventing heat loss is a priority to reduce energy bills.
High Humidity: Moisture resistance is important to prevent mold growth.
Aging Homes: Many homes need upgraded insulation to meet modern energy standards.
Comparing Spray Foam and Fiberglass Insulation
R-Value and Energy Efficiency
Insulation TypeR-Value per InchEnergy Efficiency Rating
Spray Foam (Closed-cell) 6.0 – 7.0 High
Spray Foam (Open-cell) 3.5 – 4.0 Moderate
Fiberglass Batts 2.9 – 3.8 Moderate
Fiberglass Blown-in 2.2 – 4.3 Moderate
Spray foam provides a higher R-value per inch, making it more effective at sealing air leaks. Fiberglass, though lower in R-value, is still widely used due to affordability and ease of installation.
Installation Process and Home Suitability
Spray Foam
Expands upon application, filling gaps and cracks.
Requires professional installation.
Provides an air and moisture barrier.
Fiberglass
Comes in batts or loose-fill form.
Can be installed as a DIY project or by a contractor.
Requires a vapor barrier in humid climates to prevent moisture buildup.
Cost Considerations for Michigan Homeowners
FactorSpray FoamFiberglass
Material Cost Higher Lower
Installation Cost Higher (requires pros) Lower (DIY possible)
Long-Term Savings Higher (energy savings) Moderate
While spray foam has a higher upfront cost, it can lead to long-term energy savings due to its superior air-sealing properties. Fiberglass is budget-friendly and remains a popular choice for quick insulation upgrades.
Addressing Moisture and Mold Concerns
Spray Foam’s Resistance to Moisture
Closed-cell spray foam creates a moisture barrier, reducing the risk of mold.
Recommended for basements and crawl spaces prone to damp conditions.
Fiberglass and Moisture Absorption
Can absorb moisture if not properly sealed with a vapor barrier.
May lose effectiveness if it becomes damp over time.
For homes with moisture concerns, spray foam is often the better choice. However, properly installed fiberglass insulation with an effective vapor barrier can still perform well in Michigan’s climate.
Longevity and Maintenance
FeatureSpray FoamFiberglass
Lifespan 30+ years 10-25 years
Maintenance Minimal May need replacement or adjustment
Resistance to Pests High Moderate (can attract rodents)
Spray foam has a longer lifespan and requires little maintenance. Fiberglass, while durable, may need periodic replacement or adjustments if it settles or is disturbed.
Making the Right Choice for Your Home
Best for Long-Term Efficiency & Air Sealing: Spray foam
Best for Budget-Conscious Homeowners: Fiberglass
Best for DIY Installation: Fiberglass
Best for High Moisture Areas: Spray foam (closed-cell)
If you’re considering insulation upgrades, consulting a professional can help determine the best solution based on your home’s structure and needs.
Expert Assistance for Michigan Homeowners
Insulation Services of Michigan, Inc. provides expert guidance and installation tailored to Michigan’s unique climate. If you’re unsure which insulation suits your home best, our team can assess your space and recommend a solution that balances cost, efficiency, and durability.
📞 Call us at (810) 267-4121 or email kam@ismichigan.com for a consultation.
Frequently Asked Questions (FAQs)
1. How much does spray foam insulation cost in Michigan?
Spray foam costs between $1.50 to $3.50 per square foot, depending on the type and thickness required.
2. Can fiberglass insulation be used in attics?
Yes, fiberglass batts or blown-in insulation is commonly used in attics. However, proper air sealing is crucial to maximize efficiency.
3. Does spray foam insulation help with soundproofing?
Yes, open-cell spray foam provides good sound absorption, reducing noise between walls and floors.
4. Which insulation is better for basements?
Closed-cell spray foam is ideal for basements due to its moisture resistance and ability to prevent mold growth.
5. Can I install fiberglass insulation myself?
Yes, fiberglass batts can be a DIY project. However, professional installation ensures proper air sealing and coverage.
6. Does insulation improve home value?
Yes, energy-efficient insulation can increase home value by reducing utility costs and improving comfort.
7. Is spray foam safe for indoor air quality?
Once cured, spray foam is safe. Proper ventilation during installation is necessary to avoid exposure to fumes.
8. How often should insulation be replaced?
Fiberglass may need replacement every 10-25 years, while spray foam can last over 30 years with minimal maintenance.
9. Can insulation prevent ice dams in winter?
Yes, proper insulation and air sealing reduce heat loss, preventing ice dams from forming on the roof.
10. Which insulation is more eco-friendly?
Spray foam made with renewable materials and fiberglass containing recycled glass are both environmentally conscious choices.